Merge branch 'master' of https://github.com/utwente-di/di15
Merge branch 'categories'
Merge conflicts
Updated databasequeries and databasequeries test, fixed imports
Optimized project structure and packages
Merge conflicts a
Diverge fix
Updated queries for new database layout.
Updated driver loading for SQL
Added overview page for after login
Added email-address to registration and improved UX after registration.
Merge branch 'login'
Added database creation script and modified login and register to ignore the username case
Updated DatabaseConnection to include database name in the connection string
Moved headers to separate folder to clean up the directory tree.
Added about page
Added requireLogin header that can be included in a page to require login
Added logout functionality
Updated database_scheme to include changes to the database.
Improved code style in some areas.